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arXiv 2503.04571physics.opticscond-mat.mtrl-sci
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微波频率下的磁导率时变超材料

Magnetic Permeability Time-varying Metamaterials at Microwave Frequencies

Toshiyuki Kodama, Nobuaki Kikuchi, Takahiro Chiba, Seigo Ohno, Satoshi Okamoto, Satoshi Tomita

AI总结:

本文利用坡莫合金构建GHz磁导率时变超材料,实现4 GHz微波的非对称上下变频,并通过数值计算证明高效上变频源于非线性磁化动力学。

摘要:

我们利用铁磁坡莫合金(Ni80Fe20;Py)展示了GHz频率下的磁导率时变超材料。我们观察到4 GHz微波通过该超材料时发生上变频和下变频,这是由Py层中磁导率的时间调制引起的。此外,上变频至更高频率的效率远高于下变频至更低频率的效率。这些实验结果通过数值计算得到了很好的复现,验证了显著的上变频效率源于超材料中的非线性磁化动力学。本研究为面向第六代移动通信系统的微波源、具有时空调制的四维超材料以及非线性自旋电子学打开了大门。

英文摘要:

We demonstrate magnetic permeability time-varying metamaterials at GHz frequencies using ferromagnetic permalloy (Ni80Fe20; Py). We observe frequency up and down conversion of 4 GHz microwaves through the metamaterials, which is caused by the temporal modulation of permeability in the Py layer. Moreover, the efficiency of the up-conversion to a higher frequency is much larger than that of the down conversion to a lower frequency. These experimental results are reproduced well via numerical calculation, verifying that the significant up-conversion efficiency is traced back to nonlinear magnetization dynamics in the metamaterials. The present study opens a door to microwave sources toward the 6th-generation mobile communication system, four-dimensional metamaterials with spatio-temporal modulation, and nonlinear spintronics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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